LTC具溫度電壓和電流測(cè)量功能的多節(jié)電池電量測(cè)量芯片

1、LTC2943 -具溫度、電壓和電流測(cè)量功能的多節(jié)電池電量測(cè)量芯片特點(diǎn)可測(cè)量累積的電池充電和放電電量3.6V至20V工作范圍可適合多種電池應(yīng)用14位ADC負(fù)責(zé)測(cè)量電池電壓、電流和溫度1%電壓、電流和充電準(zhǔn)確度 ±50mV檢測(cè)電壓范圍高壓側(cè)檢測(cè)適合任何電池化學(xué)組成和容量的通用測(cè)量I2C / SMBus 接口可配置警報(bào)輸出/充電完成輸入靜態(tài)電流小于 120卩A小外形8引腳3mm x 3mm DFN圭寸裝典型應(yīng)用描述LTC ?2943可測(cè)量便攜式產(chǎn)品應(yīng)用中的電池充電狀態(tài)、電池電壓、電池電流及其自身溫度。其具有寬輸入電壓范圍，因而可與高達(dá)20V的多節(jié)電池配合使用。一個(gè)精準(zhǔn)的庫侖計(jì)量器負(fù)責(zé)對(duì)流

2、經(jīng)位于電池正端子和負(fù)載或充電器之間的一個(gè)檢測(cè)電阻器電流進(jìn)行積分運(yùn)算。電池電壓、電流和溫度利用一個(gè)內(nèi)部14位無延遲增量累加 (No Latency 史)ADC來測(cè)量。測(cè)量結(jié)果被存儲(chǔ)于可通過內(nèi)置I2C / SMBus接口進(jìn)行存取的內(nèi)部存放器中。LTC2943具有針對(duì)所有 4種測(cè)量物理量的可編程高門限和低門限。如果超過了某個(gè)編程門限，那么該器件將采用SMBus警報(bào)協(xié)議或通過在內(nèi)部狀態(tài)存放器中設(shè)定一個(gè)標(biāo)記來傳送警報(bào)信號(hào)。LTC2943僅需采用單個(gè)低阻值檢測(cè)電阻器以設(shè)定測(cè)量電流范圍。應(yīng)用電開工具電動(dòng)自行車便攜式醫(yī)療設(shè)備視頻攝像機(jī)程序：#include <Arduino.h>#include

3、<stdint.h>#include "Linduino.h"#include "LT_I2C.h"#include "UserInterface.h"#include "QuikEval_EEPROM.h"#include "LTC2943.h"#include <Wire.h>/ Function Declarationvoid print_title();/ Print the title blockvoid print_prompt();/ Print the P

4、romptvoid store_alert_settings();/ Store the alert settings tothe EEPROMint8_t restore_alert_settings(); / Read the alert settings fromEEPROM#define AUTOMATIC_MODE_DISPLAY_DELAY 1000/!< Thedelay between readings in automatic mode#define SCAN_MODE_DISPLAY_DELAY 10000 /!< The delay between readi

5、ngs in scan modeconst float resistor = .100;/!<resistor value on demo board/ Error stringconst char ack_error = "Error: No Acknowledge. Check I2C Address." /!< Error message/ Global variablesstatic int8_t demo_board_connected;/!< Set to 1 if theboard is connectedstatic uint8_t ale

6、rt_code = 0;/!< Value stored or readfrom ALERT register. Shared between loop() and restore_alert_settings()/! Initialize Linduinovoid setup()char demo_name = "DC1812" /! Demo Board Name stored in QuikEval EEPROMquikeval_I2C_init(); /! Configure the EEPROM I2C port for 100kHzquikeval_I2C

7、_connect(); /! Connects to main I2C portSerial.begin(115200); /! Initialize the serial port to the PCprint_title();demo_board_connected = discover_demo_board(demo_name); if (demo_board_connected)print_prompt();elsedemo_board_connected = true;Serial.println("Did not read ID String, attempting to

8、 proceed anyway.nPlease ensure I2C lines of Linduino are connected to the LTC device");/! Repeats Linduino loopvoid loop() int8_t ack = 0; indicator/! I2C acknowledgestatic uint8_t user_command; command/! The user inputstatic uint8_t mAh_or_Coulombs = 0;static uint8_t celcius_or_kelvin = 0;stat

9、ic uint16_t prescalar_mode = LTC2943_PRESCALAR_M_4096;static uint16_t prescalarValue = 4096;static uint16_t alcc_mode = LTC2943_ALERT_MODE;if (demo_board_connected) the demo board is not connected/! Do nothing ifif (Serial.available() serial is not available/! Do nothing ifuser_command = read_int();

10、 command/! Read user inputif (user_command != 'm')Serial.println(user_command); Serial.println();ack = 0;switch (user_command) appropriate submenu/! Prints thecase 1:ack |= menu_1_automatic_mode(mAh_or_Coulombs, celcius_or_kelvin, prescalar_mode, prescalarValue, alcc_mode); /! Automatic Mode

11、break;case 2:ack |= menu_2_scan_mode(mAh_or_Coulombs, celcius_or_kelvin, prescalar_mode, prescalarValue, alcc_mode); /! Scan Modebreak;case 3:ack |= menu_3_manual_mode(mAh_or_Coulombs, celcius_or_kelvin, prescalar_mode, prescalarValue, alcc_mode); /! Manual Modebreak;case 4:ack |= menu_4_sleep_mode(

12、mAh_or_Coulombs, prescalar_mode, prescalarValue, alcc_mode); /! Sleep Modebreak;case 5:ack |= menu_5_shutdown_mode();/! Shutdown Modebreak;case 6:ack |= menu_6_settings(&mAh_or_Coulombs, &celcius_or_kelvin, &prescalar_mode, &prescalarValue, &alcc_mode); /! Settings Modebreak;if (

13、ack != 0) /! If ack is not recieved print an error.Serial.println(ack_error);Serial.print(F(" *" print_prompt();/ Function Definitions/! Print the title blockvoid print_title()Serial.println(F("n * *");Serial.print(F("* DC1812A Demonstration Program *n");Serial.print(F(

14、"*n");Serial.print(F("* This program communicates with the LTC2943 Multicell Coulomb *n");Serial.print(F("* Counter found on the DC1812A demo board. *n");Serial.print(F("* Set the baud rate to 115200 and select the newline terminator.*n");Serial.print(F("

15、*n");Serial.print(F(" * r H /! Print the Promptvoid print_prompt()Serial.print(F("n1-Automatic Moden");Serial.print(F("2-Scan Moden");Serial.print(F("3-Manual Moden");Serial.print(F("4-Sleep Moden");Serial.print(F("5-Shutdown Moden");Serial

16、.print(F("6-Settingsn");Serial.print(F("Enter a command: ");/! Automatic M8_t menu_1_automatic_mode(int8_t mAh_or_Coulombs, int8_t celcius_or_kelvin ,uint16_t prescalar_mode, uint16_t prescalarValue, uint16_t alcc_mode)/! return Returns the state of the acknowledge bit aft

17、er the I2C address write. 0=acknowledge, 1=no 8_t LTC2943_mode;int8_t ack = 0;LTC2943_mode = LTC2943_AUTOMATIC_MODE|prescalar_mode|alcc_mode ; /! Set the control register of the LTC2943 to automatic mode as well as set prescalar and AL#/CC# pin values.Serial.println();ack |= LTC2943_w

18、rite(LTC2943_I2C_ADDRESS, LTC2943_CONTROL_REG, LTC2943_mode); /! Writes the set mode to the LTC2943 control registerdoSerial.print(F("*nn");uint8_t status_code, hightemp_code, lowtemp_code;uint16_t charge_code, current_code, voltage_code, temperature_code;ack |= LTC2943_read_16_bits(LTC294

19、3_I2C_ADDRESS, LTC2943_ACCUM_CHARGE_MSB_REG, &charge_code); /! Read MSB and LSB Accumulated Charge Registers for 16 bit charge codeack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_VOLTAGE_MSB_REG, &voltage_code); /! Read MSB and LSB Voltage Registers for 16 bit voltage codeack |= LTC

20、2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_CURRENT_MSB_REG, &current_code);/! Read MSB andLSB Current Registers for 16 bit current codeack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_TEMPERATURE_MSB_REG, &temperature_code); /! Read MSB and LSB Temperature Registers for 16 bit te

21、mperature codeack |= LTC2943_read(LTC2943_I2C_ADDRESS, LTC2943_STATUS_REG, &status_code); /! Read Status Register for 8 bit status codefloat charge, current, voltage, temperature;if(mAh_or_Coulombs)charge = LTC2943_code_to_coulombs(charge_code, resistor, prescalarValue); /! Convert charge code t

22、o Coulombs if Coulomb units are desired.Serial.print("Coulombs: ");Serial.print(charge, 4);Serial.print(F(" Cn");elsecharge = LTC2943_code_to_mAh(charge_code, resistor, prescalarValue); /! Convert charge code to mAh if mAh units are desired.Serial.print("mAh: ");Serial.

23、print(charge, 4);Serial.print(F(" mAhn");current = LTC2943_code_to_current(current_code, resistor);/! Convert current code to Amperesvoltage = LTC2943_code_to_voltage(voltage_code);/! Convert voltage code to VoltsSerial.print(F("Current ");Serial.print(current, 4);Serial.print(F(

24、" An");Serial.print(F("Voltage ");Serial.print(voltage, 4);Serial.print(F(" Vn"); if(celcius_or_kelvin)temperature = LTC2943_code_to_kelvin_temperature(temperature_code); /! Convert temperature code to kelvinSerial.print(F("Temperature ");Serial.print(temperat

25、ure, 4);Serial.print(F(" Kn");elsetemperature = LTC2943_code_to_celcius_temperature(temperature_code); /! Convert temperature code to celciusSerial.print(F("Temperature ");Serial.print(temperature, 4);Serial.print(F(" Cn");checkAlerts(status_code);/! Check status code f

26、or Alerts. If an Alert has been set, print out appropriate message in the Serial Prompt.Serial.print(F("m-Main Menunn");Serial.flush(); delay(AUTOMATIC_MODE_DISPLAY_DELAY);/! Delay for 1s before next pollingwhile (Serial.available() = false | (ack);/! if Serial is not available and an NACK

27、 has not been recieved, keep polling the registers.read_int(); / clears the Serial.availablereturn(ack);/! Scan Modeint8_t menu_2_scan_mode(int8_t mAh_or_Coulombs , int8_t celcius_or_kelvin ,uint16_t prescalar_mode,uint16_t prescalarValue, uint16_t alcc_mode)/! return Returns the state of the acknow

28、ledge bit after the I2C address write. 0=acknowledge, 1=no acknowledgeint8_t LTC2943_mode;int8_t ack = 0;LTC2943_mode = LTC2943_SCAN_MODE|prescalar_mode|alcc_mode ;/! Set the control mode of the LTC2943 to scan mode as well as set prescalar and AL#/CC# pin values.Serial.println();ack |= LTC2943_writ

29、e(LTC2943_I2C_ADDRESS, LTC2943_CONTROL_REG, LTC2943_mode);/! Writes the set mode to the LTC2943control registerdoSerial.print(F("*nn");uint8_t status_code;uint16_t charge_code, current_code, voltage_code, temperature_code;ack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_ACCUM_CHARG

30、E_MSB_REG, &charge_code);/! Read MSBand LSB Accumulated Charge Registers for 16 bit charge codeack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_VOLTAGE_MSB_REG, &voltage_code);/! Read MSBand LSB Voltage Registers for 16 bit voltage codeack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS,

31、 LTC2943_CURRENT_MSB_REG, &current_code);/! Read MSBand LSB Current Registers for 16 bit current codeack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_TEMPERATURE_MSB_REG, &temperature_code); /! Read MSB and LSB Temperature Registers for 16 bit temperature codeack |= LTC2943_read(LTC2

32、943_I2C_ADDRESS, LTC2943_STATUS_REG, &status_code); /! Read Status Registers for 8 bit status codefloat charge, current, voltage, temperature;if(mAh_or_Coulombs)charge = LTC2943_code_to_coulombs(charge_code, resistor, prescalarValue);/! Convert charge codeto Coulombs if Coulomb units are desired

33、.Serial.print("Coulombs: ");Serial.print(charge, 4);Serial.print(F(" Cn");elsecharge = LTC2943_code_to_mAh(charge_code, resistor, prescalarValue);/! Convert chargecode to mAh if mAh units are desired.Serial.print("mAh: ");Serial.print(charge, 4);Serial.print(F(" mA

34、hn");current = LTC2943_code_to_current(current_code, resistor); /! Convert current code to Amperesvoltage = LTC2943_code_to_voltage(voltage_code);/! Convert voltage code to VoltsSerial.print(F("Current ");Serial.print(current, 4);Serial.print(F(" An");Serial.print(F("Vo

35、ltage ");Serial.print(voltage, 4);Serial.print(F(" Vn");if(celcius_or_kelvin) temperature =LTC2943_code_to_kelvin_temperature(temperature_code);/! Convert temperature code to Kelvin if Kelvin units are desired. Serial.print(F("Temperature ");Serial.print(temperature, 4);Seri

36、al.print(F(" Kn");elsetemperature = LTC2943_code_to_celcius_temperature(temperature_code);/! Convert temperature code to Celcius if Celcius units are desired. Serial.print(F("Temperature ");Serial.print(temperature, 4); Serial.print(F(" Cn"); checkAlerts(status_code);/!

37、 Check status code for Alerts. If an Alert has been set, print out appropriate message in the Serial PromptSerial.print(F("m-Main Menunn");Serial.flush();delay(SCAN_MODE_DISPLAY_DELAY);while (Serial.available() = false | (ack);read_int(); / clears the Serial.availablereturn(ack);/! Manual

38、Mode int8_t menu_3_manual_mode(int8_t mAh_or_Coulombs ,int8_t celcius_or_kelvin ,uint16_t prescalar_mode, uint16_t prescalarValue, uint16_t alcc_mode) /! return Returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledge int8_t LTC2943_mode;int8_t ack = 0;LT

39、C2943_mode = LTC2943_MANUAL_MODE|prescalar_mode|alcc_mode ; /! Set the control mode of the LTC2943 to manual mode as well as set prescalar and AL#/CC# pin values.Serial.println();ack |= LTC2943_write(LTC2943_I2C_ADDRESS, LTC2943_CONTROL_REG, LTC2943_mode); /! Writes the set mode to the LTC2943 contr

40、ol registerint staleData = 0;/! Stale Data Check variable. When set to 1 it indicates that stale data is being read from the voltage, current and temperature registers.doSerial.print(F("*nn");uint8_t status_code;uint16_t charge_code, current_code, voltage_code, temperature_code;ack |= LTC2

41、943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_ACCUM_CHARGE_MSB_REG, &charge_code); /! Read MSB and LSB Accumulated Charge Registers for 16 bit charge codeack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_VOLTAGE_MSB_REG, &voltage_code);/! Read MSBand LSB Voltage Registers for 16 bit v

42、oltage codeack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_CURRENT_MSB_REG, &current_code); /! Read MSB and LSB Current Registers for 16 bit current codeack |= LTC2943_read_16_bits(LTC2943_I2C_ADDRESS, LTC2943_TEMPERATURE_MSB_REG, &temperature_code); /! Read MSB and LSB Temperature

43、Registers for 16 bit temperature codeack |= LTC2943_read(LTC2943_I2C_ADDRESS, LTC2943_STATUS_REG, &status_code); /! Read Status Registers for 8 bit status codefloat charge, current, voltage, temperature;if(mAh_or_Coulombs)charge = LTC2943_code_to_coulombs(charge_code, resistor, prescalarValue);/

44、! Convert charge codeto Coulombs if Coulomb units are desired.Serial.print("Coulombs: ");Serial.print(charge, 4);Serial.print(F(" Cn");elsecharge = LTC2943_code_to_mAh(charge_code, resistor, prescalarValue); /! Convert charge code to mAh if mAh units are desired.Serial.print(&quo

45、t;mAh: ");Serial.print(charge, 4);Serial.print(F(" mAhn");current = LTC2943_code_to_current(current_code, resistor); /! Convert current code to Amperesvoltage = LTC2943_code_to_voltage(voltage_code);/! Convert voltage code to VoltsSerial.print(F("Current ");Serial.print(curr

46、ent, 4);Serial.print(F(" A");if(staleData) Serial.print(F(" * Stale Data*n"); /! If Stale data is inside the register after initial snapshot, Print Stale Data message.else Serial.println("");Serial.print(F("Voltage ");Serial.print(voltage, 4);Serial.print(F(&q

47、uot; V");if(staleData) Serial.print(F(" * Stale Data*n"); /! If Stale data is inside the register after initial snapshot, Print Stale Data message.else Serial.println("");if(celcius_or_kelvin)temperature = LTC2943_code_to_kelvin_temperature(temperature_code); /! Convert temp

48、erature code to Kelvin if Kelvin units are desired.Serial.print(F("Temperature ");Serial.print(temperature, 4);elsetemperature = LTC2943_code_to_celcius_temperature(temperature_code);/! Convert temperature code to Celcius if Celcius units are desired. Serial.print(F("Temperature "

49、;);Serial.print(temperature, 4);Serial.print(F(" C");if(staleData) Serial.print(F(" * Stale Data *n"); else Serial.println("");checkAlerts(status_code);/! Check status code for Alerts. If an Alert has been set, print out appropriate message in the Serial PromptSerial.pr

50、int(F("m-Main Menunn");staleData = 1;Serial.flush(); delay(AUTOMATIC_MODE_DISPLAY_DELAY);while (Serial.available() = false | (ack); read_int(); / clears the Serial.available return(ack);/! Sleep Modeint8_t menu_4_sleep_mode(int8_t mAh_or_Coulombs ,uint16_t prescalar_mode, uint16_t prescala

51、rValue, uint16_t alcc_mode)/! return Returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledgeint8_t LTC2943_mode;int8_t ack = 0;LTC2943_mode = LTC2943_SLEEP_MODE|prescalar_mode|alcc_mode ;/! Set the control mode of the LTC2943 to sleep mode as well as set

52、 prescalar and AL#/CC# pin values.Serial.println();ack |= LTC2943_write(LTC2943_I2C_ADDRESS, LTC2943_CONTROL_REG, LTC2943_mode);/! Writes the set mode to the LTC2943control registerdoSerial.print(F("*nn");delay(100);uint8_t status_code;uint16_t charge_code;ack |= LTC2943_read_16_bits(LTC29

53、43_I2C_ADDRESS, LTC2943_ACCUM_CHARGE_MSB_REG, &charge_code); /! Read MSB and LSB Accumulated Charge Registers for 16 bit charge codeack |= LTC2943_read(LTC2943_I2C_ADDRESS, LTC2943_STATUS_REG, &status_code);/! Read Status Registers for 8bit status codefloat charge;if(mAh_or_Coulombs)charge =

54、 LTC2943_code_to_coulombs(charge_code, resistor, prescalarValue); /! Convert charge code to Coulombs if Coulomb units are desired.Serial.print(charge, 4);Serial.print(F(" Cn");elsecharge = LTC2943_code_to_mAh(charge_code, resistor, prescalarValue); /! Convert charge code to mAh if mAh unit

55、s are desired.Serial.print("mAh: ");Serial.print(charge, 4);Serial.print(F(" mAhn");Serial.print(F("Current ");Serial.print(F(" ADC Sleep.n");Serial.print(F("Voltage ");Serial.print(F(" ADC Sleep.n");Serial.print(F("Temperature ")

56、;Serial.print(F(" ADC Sleep.n");Serial.print(F("m-Main Menunn");checkAlerts(status_code);Serial.flush();delay(AUTOMATIC_MODE_DISPLAY_DELAY);while (Serial.available() = false | (ack);read_int(); / clears the Serial.availablereturn(ack);/! Shutdown Modeint8_t menu_5_shutdown_mode()

57、/! return Returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledgeint8_t ack = 0;ack |= LTC2943_write(LTC2943_I2C_ADDRESS, LTC2943_CONTROL_REG, LTC2943_SHUTDOWN_MODE);/! Sets the LTC2943into shutdown modeSerial.print("LTC2943 Has Been ShutDownn"

58、);return(ack);/! Settings Menuint8_t menu_6_settings(uint8_t *mAh_or_Coulombs, uint8_t *celcius_or_kelvin, uint16_t *prescalar_mode, uint16_t *prescalarValue, uint16_t *alcc_mode)/! return Returns the state of the acknowledge bit after the I2C address write. 0=acknowledge, 1=no acknowledgeint8_t ack = 0;int8_t user_command;doSerial.print(F("*nn");Serial.print(F("1-Set Alert Thresholdsn");